Portable saw-mill



(No Model.) 6 Sheets-Sheet 1.

H. WRIGHT.

PORTABLE SAW MILL.

No. 332.690. Patented Dec. 15, 18-85.

kill? 1 (No Model.) 6 Sheets-Sheet 2. H. WRIGHT.

PORTABLE SAW MILL.

INVEN TOR.

Patented Dec. 15, 1885.

H. WRIGHT.

MILL. No, 332,690. Patented Dec. 15, 1885.

INVENTOR.

(No Model.) 6 SheetsShe et 4.

H. WRIGHT.

PORTABLE SAW MILL.

No. 332,690. Patented Dec. 15, 1885.

WITNESSES: 1N VEN TOR.

jaw W (No Model.) 6 Sheets-Sheet 5. H. WRIGHT.

PORTABLE SAW MILL. No. 332,690. Patented Dec. 15, 1885.

IN VENTOR.

Ill

III/Id m HW////////// w 6 Sheets-Sheet 6.

(No Model.)

H..WRIGHT.

PORTABLE SAW MILL.

Patented Dec. 15. 1885.

INVENTOR.

mmnnnTTw WITNESSES HUGH \VRIGHT, OF NE? LISBON, OIIIO.

PORTABLE SAW-MILL.

SPECIFICATION forming part of Letters Patent No. 332,690, dated December15, 1885.

Application filed December 29, 1883. Serial No. 115,899.

To aZZ whom it may concern:

Be it known that I, HUGH WRIGHT, of New Lisbon, in the county ofColumbiana and State of Ohio, have invented a new and useful Improvementin Portable Saw-Mills; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention has for its object the construction of a light, strong,durable, and efficient portable saw-mill, with economy of material andin cost of construction.

My invention consists in the peculiar construction, combination, andarrangement of the several parts which enter into the construction ofthe improvement of the new and portable saw-mill, which will behereinafter more fully described.

To enable others skilled in the art with which myinvention is mostnearly connected to make and use it, I will proceed to describe itsconstruction and operation.

In the accompanying drawings, which form part of this specification,Figure 1 is a perspective view of my improvement in portable sawmills.Fig. 2 is a top view or plan of the same. Fig. 3 is an inverted view ofthe sawframe. Fig. 4 is an end elevation of said mill. Figs. 5, 6, 7, 8,9, 10, 11, and 12 are detail views.

Reference being had to the accompanying drawings, A represents the frameof the saw, which frame is constructed of cast-iron, and its form isclearly indicated in Figs. 2-, 3, 7, and 8, and is of such form andconstruction that it covers and incloses the driving mechanism employedfor the feed of the mill.

By this form and construction ofthe frameA the said driving mechanismand the main shaft for the saw are covered, inclosed, and protected fromrain, snow, sawdust, falling pieces of timber, and all liability toaccident or tripping of the operator. The frame A is secured to thetrack or way B, the inner timber of which is provided with a T-rail ofiron, (marked 0.) Said track or way may be constructed in a series ofsections, secured together by any means known to the art, and may be ofany length desired. The head-blocks D in'outline are T-shaped, and areconcaved on their under side for the purpose of economy of ma- (Nomodel.)

terial and lightness, and are provided with two friction-rollers, E,having doubie flanges, which straddle the head or tread of the iron T-rail O,as shown in Fig; 6. The head-blocks D are also provided at theirouter end with a friction-roller, F, having a plain tread, which travelson a flat iron rail, G, secured on the outer timber of the track or way13. To the ends of the inner limbs of the head-blocks D are securedyokes H, which straddle the head or tread of T- rail 0, and are employedfor the purpose ofpreventing the displacement of the head-blocks D. Tothe under side of the headblocks D is attached a feed-rack, I, into theteeth of which mesh the teeth of a pinion, J, mounted on the shaft K, onthe inner end of which is a sprocket-whecl, L, which is operated throughthe medium of the endless chain M, which passes overasprocket-wheel, N,on the shaft 0, journaled in a pivoted frame, 1?, (shown in Figs. 4 and7,) which pivoted frame P is provided with double pivot-points, (markedab.) (Shownin Fig. 10.) This arrangement of the double pivot-points a bfor the pivoted frame I? adapts it for either a right or left handedmill. To the forward head-block is attached a graduatingarch, Q,provided with a large number of openings for the reception of a stop-pinfor regulating the stroke of the lever B and throw of the pawl 0. To thegraduating-arch Q is pivoted one or more stoppawls, c, for holding thewheel S in a fixed position after each movement of it by the lever R andpawl c. The wheel S is mounted on the set shaft or rod T, which isprovided with a longitudinal groove, into which is fitted a tongue inthe bore of the wheel S. The setrod T may be of any desired length foradapt-.

ing the mill to the sawing of lumber of different lengths. On the setshaft or rod T are pinions d, the bore of which gradually increases indiameter from the center toward each end, for the purpose of allowingsaid pinions to vibrate on the set shaft or rod T. The bore of each ofthese pinions d has an inwardly-projecting tongue, which fits in alongitudinal groove in the set shaft or rod T, as shown in Fig. 12. Inthe periphery of the pinions d is a groove, 6, into which is fitted atongue, f, formed in the outer ends of the head-blocks D, for thepurpose of keeping said pinions in proper position with relation to andin mesh with the gear-teeth g on the under side of the knees U, to whichare pivoted the ordinary dogs, h. The knees U have side projectingflanges, i, and detachable guides j, which catch under flanges It, forthe purpose of preventing the forward end of the knees U from verticallift. On the outer end of the head-blocks D are detachable guides Z,which catch over the upper side of the projecting flangest' of the kneesU,for holding the outer end ofsaid knees down on the head-blocks D.

By the hereinbefore-described construction and arrangement of the setmechanism the skillful sawyer can out lumber of any desired g By thepeculiar arrangement of the knees and their guides herein described theyare not liable to become clogged with ice in wet and freezing Weather.

The great advantage in operating a sawmill (when itis not under shelter)with a freeacting set mechanism and without liabilityof becoming cloggedwith snow and ice will be apparent to those having experience inoperating portable saw-mills.

To the set-lever R is pivoted a secondary V set-lever, m, by means ofwhich the Sawyer can operate the set mechanism without the necessity ofpassing over or around to the opposite side of the mill. On the mainsawshaft V are mounted the main driving-pulley WV, pulleysn 0p, and sawX. On the shaftO is mounted a differential pulley, Y, having threefrictional surfaces (marked q r s) for giving different rates of speedto the shaft 0, and thereby giving different rates of speed to thesprocket-wheel L, endless chain M, sprocketwheel N, shaftK, and pinionJ, which meshes into the feed-rack I, and thereby producing differentrates of speed for feeding the timber to the saw X. The differentialpulley is moved longitudinally on the shaft 0 through medium of theshifting-lever 73.

To the pivoted frame P is attached a lever, a, by means of which saidframe can be elevated for bringing the different frictional surfaces ofthe differential pulley Y against the pulleys n 010, as may bedetermined upon by the sawyer. The pivoted frame F is moved into theposition shown in Fig. 9 in dotted lines by lifting the lever to,thereby bringing the periphery of the pulleyo down on the inner surfaceof the rim of the main drivingpulley W, (see Figs. 7 and 8,) therebyobtaining a reverse motion of the feed mechanism. pressing down on thelever u, thereby bringing the differential pulley against the pulleys n0 p, for the purpose hereinbefore stated.

' When it is desired to construct a double saw-mill,two uprights aresecured to the frame A, on which uprights w a; are arranged adjustablejournals 3 constructed in one piece, for carrying the shaft a of the saw12, which shaft is provided with a driving-pulley, c. To the upright wis pivoted a hanger, d, in the end of which is journaled a shaft,'e,upon The pivoted frame P is elevated by which are mounted pulleysf g.Over pulleys g, and c is placed a belt for transmitting motion from thepulley g to the pulley c, shaft a, and saw I). To the hanger d isattached an adjustable lever (marked h) for moving the hanger so as tobring the periphery of the pulleyf against the inner surface of the rimof the main driving-pulley W, thereby revolving it, which motion istransmitted to the saw I).

By constructing the head-blocks as herein described great strength isobtained with economy of material; and the form and peculiarconstruction of the frame A forms a perfect protection for the feedmechanism, gives ample room for the truck used for earrying off thesawed lumber, and at the same time combines strength and lightness insaid frame, and enables the manufacturer to construct a light, durable,and efficient saw-mill, with all its parts easily reached for thepurpose of lubrication or repair, which, in connection with theadvantages hereinbefore mentioned, will supply what is desirable in aportable saw-mill.

The devices employed for feeding the earriage and those for transmittingmotion from the main saw-shaft to the small saw are claimed in divisionsof this application filed June 17, 1885, Serial Nos. 168,919 and168,937.

Having thus described my improvement, what I claim as of my inventionis- 1. In a saw-mill, the combination, with a trackway consisting of anouter flat rail, G, and an inner T-rail, O, of the head-blocks D andfeed-rack I, connecting the same, the said head-blocks having at theirouter ends the friction-wheels F, and having attheir inner ends hollowcross extensions D, bearing flanged wheels E, said cross-extensionsbeing also provided at each of their extremities with yokes H, extendingbeneath the flange of the T-rail, substantially as shown and described.

2. In a saw-mill, the combination, with the head-blocks D and thesuperjacent knees U, said knees being provided on their under sides withgear rack-teeth g, of the set-shaft I, having pinions d, engaging withsaid teeth and splined upon the shaft, the bore of said pinionsgradually increasing from their centers toward their ends, the pinionsbeing provided with peripheral grooves e, and the head-blocks withcorresponding tongues, f, fitting therein, substantially as set forth.

3. In a saw-mill, the combination, with the head-block D, having theupper flange, 7c, of the'superjacent knee U, provided on its under sidewith the rack-flange i, the head-block being furthermore provided at itsouter end with the detachable guide Z, and the knee being provided atits inner end with the detachable guide j, substantially as set forth.

HUGH WRIGHT. W'itnesses:

. WM. E. DYRE,

JAMES J. J oHNsroN.

